关于mfc下多线程socket出错

问？：

我用CSocket写通信程序，但执行到下面的函数时总出错，是什么原因？
是多线程通信，每个线程创建了一个套接字:CMySocket *m_pClientSocket = New CMySocket;
然后在OnSendSocket函数中调用：m_pClientSocket->Send(str,len);
如果消息很少，或者中间有Sleep，则没有错误，否则必然出现ASSERT(pState->m_hSocketWindow != NULL);的错误。
听说
1 是一个Bug，我用VC 5.0也打了sp5,
2 同一个套接字不能在不同的线程传输，但是我每一个线程创建了一个单独的套接字
3 没有调用AfxSockInit()，但是我在每个线程的初始化中都调用了这个函数。
现在实在没有办法解决，请大家帮忙，感谢！


下面的函数是 .../MFC/SRC/SOCKCORE.CPP 里的函数。
BOOL CSocket::PumpMessages(UINT uStopFlag)
{
// The same socket better not be blocking in more than one place.
ASSERT(m_pbBlocking == NULL);

_AFX_SOCK_THREAD_STATE* pState = _afxSockThreadState;

ASSERT(pState->m_hSocketWindow != NULL); //这句出错这句出错这句出错这句出错

BOOL bBlocking = TRUE;
m_pbBlocking = &bBlocking;

 

 

答：(from microsoft)

Most frequently, this problem is due to the sharing of CSocket objects between multiple threads.

A CSocket object should be used only in the context of a single thread because the SOCKET handle encapsulated by a CAsyncSocket object is stored in a per-thread handle map. (CSocket is derived from CAsyncSocket.) Other information is stored on a per-thread basis, including a hidden notification window that MFC uses for socket notifications.

The assertion failure line, which can be found in Sockcore.cpp in the /Msvc20/Mfc/Src directory, is:

   ASSERT(pThreadState->m_hSocketWindow != NULL);

				

This assertion failure occurs because the CSocket object was either created or accepted in the context of another thread. The socket notification window was created in a different thread, and the m_hSocketWindow for the current thread is NULL, thus the assertion failure.